[coreboot] Re: Sandybridge-M help request in setting up LVDS panel.

[Jose Trujillo]

I have no idea bro.... may be I am doing something wrong.

This original FW of this embedded system is FULL OF BUGS... even the latest release.
I can guess many of you don't have problems doing it this way.
Maybe I have an early release of VBIOS which doesn't work with coreboot as expected.
The libgfxinit solution given by our friend Nico today works.

Later I will try another panel and variant of embedded system.
Thank you,
Jose Trujillo.
> [Got it.]
>
> Does that mean coreboot+tianocore where it has to install GOP protocol and can’t really working with VBIOS/OpRom?
>
> Thanks,
>
> Subrata
>
> From: Jose Trujillo [mailto:[e-mail]]
> Sent: Wednesday, December 4, 2019 5:27 PM
> To: Banik, Subrata 
> Subject: RE: [coreboot] Sandybridge-M help request in setting up LVDS panel.
>
> Dear Subrata:
>
> I got the pdf.
>
> I already tested all modes and even video mode 105 is showing only vertical lines.
>
> 101 = 640x480 256 colors = vertical lines.
>
> 103 = 800x600 256 colors = vertical lines.
>
> 105 = 1024x768 256 colors = vertical lines.
>
> 111 = 640x480 64k colors = vertical lines.
>
> 112 = 640x480 16M colors = vertical lines.
>
> 114 = 800x600 64k colors = vertical lines.
>
> 115 = 800x600 16M colors = vertical lines.
>
> 117 = 1024x768 64k colors =  vertical lines.
>
> 118 = 1024x768 16M colors = vertical lines.
>
> But in some modes when the system boots to linux it does with good video on the panel.
>
> Just never good video on coreboot-tianocore.
>
> Jose.
> > FYI
> >
> > https://pdos.csail.mit.edu/6.828/2018/readings/hardware/vbe3.pdf
> >
> > Thanks,
> >
> > Subrata
> >
> > -----Original Message-----
> > From: Banik, Subrata
> > Sent: Wednesday, December 4, 2019 2:13 PM
> > To: 'Jose Trujillo' 
> > Subject: RE: [coreboot] Sandybridge-M help request in setting up LVDS panel.
> >
> > HI Jose,
> >
> > I believe first you should try one off below mode to see if your display is working proper.
> >
> > Supported Video Mode list for OpRom:
> >
> > 105
> >
> > 117
> >
> > 118
> >
> > 112
> >
> > 114
> >
> > 115
> >
> > 101
> >
> > 103
> >
> > 111
> >
> > I guess if you download VESA spec you might know about all those mode more and know what is supported X, Y and bit width.
> >
> > Thanks,
> >
> > Subrata
> >
> > -----Original Message-----
> >
> > From: Jose Trujillo [mailto:[e-mail]]
> >
> > Sent: Wednesday, December 4, 2019 2:10 PM
> >
> > To: Banik, Subrata
> >
> > Subject: RE: [coreboot] Sandybridge-M help request in setting up LVDS panel.
> >
> > Good morning Subrata:
> >
> > You were right!
> >
> > #116 doesn't appear on the list.
> >
> > Then how the original FW support it?
> >
> > I am even working (building and flashing) on this panel.
> >
> > Also remember even at video mode #118 the system halts with vertical lines.
> >
> > Any workaround for this?
> >
> > This panel is 1024x768@18bit and I will test another one 1024x768@24bit to see...
> >
> > CBFS: Locating 'pci8086,0116.rom'
> >
> > CBFS: Found @ offset 2d440 size 10000
> >
> > In CBFS, ROM address for PCI: 00:02.0 = ffe3d688 Copying VGA ROM Image from ffe3d688 to 0xc0000, 0xf200 bytes Calling Option ROM...
> >
> > intel_vga_int15_handler: AX=5f34 BX=c000 CX=0002 DX=03da
> >
> > intel_vga_int15_handler: AX=5f52 BX=0000 CX=0002 DX=0008 Unknown INT15 function 5f52!
> >
> > int15 call returned error.
> >
> > intel_vga_int15_handler: AX=5f14 BX=078f CX=000a DX=fde8 Unknown INT15 function 5f14!
> >
> > int15 call returned error.
> >
> > intel_vga_int15_handler: AX=5f35 BX=c000 CX=0002 DX=03da
> >
> > intel_vga_int15_handler: AX=5f70 BX=c003 CX=0002 DX=0303 ... Option ROM returned.
> >
> > Supported Video Mode list for OpRom:
> >
> > 105
> >
> > 117
> >
> > 118
> >
> > 112
> >
> > 114
> >
> > 115
> >
> > 101
> >
> > 103
> >
> > 111
> >
> > VBE: Getting information about VESA mode 4116
> >
> > VBE: Function call failed!
> >
> > Error: In vbe_get_mode_info function
> >
> > Thank you,
> >
> > Jose Trujillo.
> > > Hi Jose,
> > >
> > > Can you please try below code changes ?
> > >
> > > diff --git a/src/device/oprom/realmode/x86.c
> > > b/src/device/oprom/realmode/x86.c index 0a5ede3..12c70cb 100644
> > > --- a/src/device/oprom/realmode/x86.c
> > > +++ b/src/device/oprom/realmode/x86.c
> > > @@ -437,6 +437,7 @@ void run_bios(struct device *dev, unsigned long
> > > addr) realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff,
> > > 0x0, 0x0); printk(BIOS_DEBUG, "... Option ROM returned.\n");
> > >
> > >     vbe_oprom_supported_mode_list();
> > >
> > >
> > >
> > > #if CONFIG(FRAMEBUFFER_SET_VESA_MODE)
> > > if ((dev->class >> 8)== PCI_CLASS_DISPLAY_VGA)
> > >
> > >             vbe_set_graphics();
> > >
> > >
> > > Thanks,
> > > Subrata
> > >